NSA The National Security Agency (NSA) is responsible for monitoring radio broadcasting, communications, the Internet, and especially secret military and diplomatic communications. Its funding is more than that of the CIA, and it is the unit that employs the largest number of mathematics doctors and computer experts alone in the world. However, its welfare is very low and even unknown to other departments of the US government, so its abbreviation NSA is often dubbed as "there is no such institution".

The US Federal Bureau of Investigation (FBI) is the main investigation agency of the US Department of Justice. Its duty is to investigate specific crimes. The FBI is also authorized to cooperate with other law enforcement agencies to provide services such as fingerprint identification, laboratory inspection and police training. According to Article 28, Section 533 of the United States Code, the Attorney General has the right to "appoint officials to investigate crimes against the United States", and other federal decrees give the FBI the power and responsibility to investigate specific crimes.

Cia. The Central Intelligence Agency (CIA) is the largest intelligence agency in the United States (the spy and counterintelligence agency of the US government, and also the general coordinator of the huge intelligence system in the United States). Its main task is to openly and secretly collect and analyze information about foreign governments, companies and individuals in politics, culture, science and technology, coordinate the activities of other domestic intelligence agencies, and report this information to the work of various departments of the US government.

SEAL: I don't know what department it is, but I know it's short for SEAL.

The intelligence department of our country is mainly the Ministry of National Security, not the National Security Bureau, but the Ministry of Security, which is responsible for domestic security, and the General Staff Intelligence Department is responsible for foreign affairs. The KGB is the KGB, the intelligence organization of the former Soviet Union. It is not clear whether it still exists. Israel's Mossad is an excellent intelligence organization, a world-famous intelligence organization, and of course there are a series of excellent intelligence organizations such as MI5.